It is important to note also that this study looked at immediate, life only annuities in the context of stochastic (unknown, random) negative health events.

When one thinks about such in that context, it is easy to see that it would not make much sense for someone to have taken out a life-only income stream and then die a short time later and/or experience a significant decline in health shortly after purchase.

The only time I recommend someone consider a life-only option from anything (like a pension) is when they are single, have no desire to leave assets to anyone, and have other means to access liquid assets and investments. There are simply too many better alternatives.